Heres a great technique gear guys can use, coming from a flyguy.
Instead of using a corky,yarn,etc. when bouncing lead, pinch a small clump of Marabou about 2" long and insert it in the egg loop of the hook and then tighten.
Wallah! There is your "black leech" !
Black marabou is the most DEADLY material when Flyfishing for Steelhead, which also can be for gear throwing.
Good luck!

Peter ><>
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Matthew 4:19